package com.jdy.haoduoaiteacher.util;

import android.content.Context;
import android.os.Environment;
import android.text.TextUtils;

import java.io.File;
import java.math.BigDecimal;

/**
 * 
 * @author Hufei
 * 
 */
public class CacheManager {
  /**
   * * 清除本应用内部缓存(/data/data/com.xxx.xxx/cache) * *
   * 
   * @param context
   */
  public static void cleanInternalCache(Context context) {
    deleteFilesByDirectory(context.getCacheDir());
  }

  /**
   * * 清除本应用所有数据库(/data/data/com.xxx.xxx/databases) * *
   * 
   * @param context
   */
  public static void cleanDatabases(Context context) {
    deleteFilesByDirectory(new File("/data/data/" + context.getPackageName()
        + "/databases"));
  }

  /**
   * * 清除本应用SharedPreference(/data/data/com.xxx.xxx/shared_prefs) *
   * 
   * @param context
   */
  public static void cleanSharedPreference(Context context) {
    deleteFilesByDirectory(new File("/data/data/" + context.getPackageName()
        + "/shared_prefs"));
  }

  /**
   * * 按名字清除本应用数据库 * *
   * 
   * @param context
   * @param dbName
   */
  // public static void cleanDatabaseByName(Context context, String dbName) {
  // context.deleteDatabase(dbName);
  // }

  /**
   * * 清除/data/data/com.xxx.xxx/files下的内容 * *
   * 
   * @param context
   */
  public static void cleanFiles(Context context) {
    deleteFilesByDirectory(context.getFilesDir());
  }

  /**
   * * 清除外部cache下的内容(/mnt/sdcard/android/data/com.xxx.xxx/cache)
   * 
   * @param context
   */
  public static void cleanExternalCache(Context context) {
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
      deleteFilesByDirectory(context.getExternalCacheDir());
    }
  }

  /**
   * * 清除自定义路径下的文件，使用需小心，请不要误删。而且只支持目录下的文件删除 * *
   * 
   * @param filePath
   * */
  public static void cleanCustomCache(String filePath) {
    deleteFilesByDirectory(new File(filePath));
  }

  /**
   * * 清除本应用所有的数据 * *
   * 
   * @param context
   * @param filepath
   */
  public static void cleanApplicationData(Context context, String... filepath) {
    cleanInternalCache(context);
    cleanExternalCache(context);
    cleanDatabases(context);
    cleanSharedPreference(context);
    cleanFiles(context);
    if (Tools.isEmpty(filepath)) {
      return;
    }
    for (String filePath : filepath) {
      cleanCustomCache(filePath);
    }
  }

  /**
   * * 删除方法 这里只会删除某个文件夹下的文件，如果传入的directory是个文件，将不做处理 * *
   * 
   * @param directory
   */
  // private static void deleteFilesByDirectory(File directory) {
  // if (directory != null && directory.exists() && directory.isDirectory()) {
  // for (File item : directory.listFiles()) {
  // item.delete();
  // }
  // }
  // }

  private static boolean deleteFilesByDirectory(File dir) {
    if (dir != null && dir.isDirectory()) {
      String[] children = dir.list();

      if (children != null) {
        for (int i = 0; i < children.length; i++) {
          boolean success = deleteFilesByDirectory(new File(dir, children[i]));
          if (!success) {
            return false;
          }
        }
      }

    }

    if (dir != null) {
      return dir.delete();
    } else {
      return false;
    }
  }

  // 获取文件
  // Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/
  // 目录，一般放一些长时间保存的数据
  // Context.getExternalCacheDir() -->
  // SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据
  public static long getFolderSize(File file) throws Exception {
    long size = 0;
    try {
      File[] fileList = file.listFiles();
      for (int i = 0; i < fileList.length; i++) {
        // 如果下面还有文件
        if (fileList[i].isDirectory()) {
          size = size + getFolderSize(fileList[i]);
        } else {
          size = size + fileList[i].length();
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    return size;
  }

  /**
   * 删除指定目录下文件及目录
   * 
   * @param deleteThisPath
   * @param filepath
   * @return
   */
  public static void deleteFolderFile(String filePath, boolean deleteThisPath) {
    if (!TextUtils.isEmpty(filePath)) {
      try {
        File file = new File(filePath);
        if (file.isDirectory()) {// 如果下面还有文件
          File files[] = file.listFiles();
          for (int i = 0; i < files.length; i++) {
            deleteFolderFile(files[i].getAbsolutePath(), true);
          }
        }
        if (deleteThisPath) {
          if (!file.isDirectory()) {// 如果是文件，删除
            file.delete();
          } else {// 目录
            if (file.listFiles().length == 0) {// 目录下没有文件或者目录，删除
              file.delete();
            }
          }
        }
      } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
  }

  /**
   * 格式化单位
   * 
   * @param size
   * @return
   */
  public static String getFormatSize(double size) {
    double kiloByte = size / 1024;
    if (kiloByte < 1) {
      return size + "Byte";
    }

    double megaByte = kiloByte / 1024;
    if (megaByte < 1) {
      BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
      return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
          + "KB";
    }

    double gigaByte = megaByte / 1024;
    if (gigaByte < 1) {
      BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
      return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
          + "MB";
    }

    double teraBytes = gigaByte / 1024;
    if (teraBytes < 1) {
      BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
      return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
          + "GB";
    }
    BigDecimal result4 = new BigDecimal(teraBytes);
    return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB";
  }

  public static String getCacheSize(File file) throws Exception {
    return getFormatSize(getFolderSize(file));
  }

  public static String getCacheSize(Context ctx) throws Exception {
    return getFormatSize(getFolderSize(ctx.getCacheDir())
        + getFolderSize(ctx.getExternalCacheDir())
        + getFolderSize(new File("/data/data/" + ctx.getPackageName()
            + "/shared_prefs")));
  }

}